By three methods we may learn wisdom:
First, by reflection, which is noblest;
Second, by imitation, which is easiest;
And third by experience, which is the bitterest.
The illustrati0n is Confucius, gouache on paper (The Granger Collection, New York) c.1770 via Wikimedia
It is amusing (if you share my possibly warped sense of humour) to see that the artist has depicted Confucius missing his front teeth. One might almost think that one of his readers was so irritated at constantly being showered with good advice that he knocked them out.